Kouros (Ancient Greek: κοῦρος, pronounced [kûːros], plural kouroi) is the modern term given to free-standing Ancient Greek sculptures that depict nude male youths. They first appear in the Archaic period in Greece and are prominent in Attica and Boeotia, with a less frequent presence in many other Ancient Greek territories such as Sicily. Such statues are found across the Greek-speaking world; the preponderance of these were found in sanctuaries of Apollo with more than one hundred from the sanctuary of Apollo Ptoion, Boeotia, alone. These free-standing sculptures were typically marble, but the form is also rendered in limestone, wood, bronze, ivory and terracotta. They are typically life-sized, though early colossal examples are up to 3 meters tall.

The female sculptural counterpart of the kouros is the kore.